SS/GI connection
SS/GI connection
(OP)
Hello everyone,
Is there a risk from connecting a Stainless Steel 316L duct to a galvanized steel duct directly together (only thing seperating them is the gasket in between the flanges)?
If so what would be the recommendation to avoid galvanic corrosion?
On a similar note, let us say there are motorized dampers with stainless steel (316L) frames that are to be connected to a GI duct, should there also be a protection if the above holds?
Thanks.
Is there a risk from connecting a Stainless Steel 316L duct to a galvanized steel duct directly together (only thing seperating them is the gasket in between the flanges)?
If so what would be the recommendation to avoid galvanic corrosion?
On a similar note, let us say there are motorized dampers with stainless steel (316L) frames that are to be connected to a GI duct, should there also be a protection if the above holds?
Thanks.





RE: SS/GI connection
RE: SS/GI connection
For galvanic corrosion to occur, the two dissimilar metals must be in electrical contact and "bridged" by an electrically conductive liquid. Your application may not even qualify for galvanic corrosion.
See also http://www.galvanizeit.org/images/uploads/drGalv/S...
Dejan IVANOVIC
Process Engineer, MSChE
RE: SS/GI connection
RE: SS/GI connection
Tough I cannot answer for afa13's reasoning for switching materials, I have seen many exhaust duct work systems that use aluminum or stainless steel duct work for the showers, then switch galvanized steel once they are comfortable the combined mixed air streams (usually air from a locker room) will not condense out.
RE: SS/GI connection
RE: SS/GI connection
B.E.
You are judged not by what you know, but by what you can do.
RE: SS/GI connection
The switch from GI to SS is for protection purposes. The room the SS duct is serving has batteries in it and due to chemicals GI might corrode thus the change in materials. The SS is used in the supply as well as the exhaust.
RE: SS/GI connection
this will be trouble in practice.
however, there is even more trouble if you plan to connect this to some centralized system.
RE: SS/GI connection
RE: SS/GI connection
the issue is not thge material of the duct for this has already been agreed upon. Ducting serving hazardous areas will be SS (fully welded).
The issue is the connection between the two materials which will be done in an adjacent room. The ss branch will connect to the GI duct in an adjacent room and then serve the hazardous area. The concer was the connection of the SS to GI.
However, i managed to solve it.
I appreaciate it guys.